integrating aws-sdk to angular2 gives “Cannot find module 'stream'”

Question

I tried these

• error TS2304: Cannot find name 'Buffer' ,
• https://github.com/aws/aws-sdk-js/issues/994 and
• Using aws-sdk with angular2

My typings and @types/node seems to have been installed properly. Here are error details:

ERROR in /Users/ishandutta2007/Documents/Projects/myproj/node_modules/aws-sdk/lib/http_response.d.ts (1 ,25): Cannot find module 'stream'.) /Users/ishandutta2007/Documents/Projects/myproj/node_modules/aws-sdk/lib/http_response.d.ts (14,18): Cannot find name 'Buffer'.)

tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "outDir": "./dist/out-tsc",
    "baseUrl": "src",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2016",
      "dom"
    ]
  }
}

package.json

{
  "name": "reactvidsangular",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "webpack-dev-server --port=4200",
    "build": "webpack",
    "test": "karma start ./karma.conf.js",
    "lint": "ng lint",
    "e2e": "protractor ./protractor.conf.js",
    "prepree2e": "npm start",
    "pree2e": "webdriver-manager update --standalone false --gecko false --quiet"
  },
  "private": true,
  "dependencies": {
    "@angular/common": "^2.4.0",
    "@angular/compiler": "^2.4.0",
    "@angular/core": "^2.4.0",
    "@angular/forms": "^2.4.0",
    "@angular/http": "^2.4.0",
    "@angular/platform-browser": "^2.4.0",
    "@angular/platform-browser-dynamic": "^2.4.0",
    "@angular/router": "^3.4.0",
    "@types/jasmine": "2.5.38",
    "@types/node": "^6.0.66",
    "angular2-social-login": "^2.1.0",
    "aws-sdk": "^2.32.0",
    "core-js": "^2.4.1",
    "jquery": "^3.2.1",
    "mystartup_commons": "bitbucket:ishan_dutta/mystartup_commons",
    "ng2-bootstrap": "^1.4.2",
    "rxjs": "^5.1.0",
    "zone.js": "^0.7.6"
  },
  "devDependencies": {
    "@angular/cli": "1.0.0-rc.4",
    "@angular/compiler-cli": "^2.4.0",
    "autoprefixer": "^6.5.3",
    "codelyzer": "~2.0.0",
    "css-loader": "^0.26.1",
    "cssnano": "^3.10.0",
    "exports-loader": "^0.6.3",
    "file-loader": "^0.10.0",
    "istanbul-instrumenter-loader": "^2.0.0",
    "jasmine-core": "~2.5.2",
    "jasmine-spec-reporter": "~3.2.0",
    "json-loader": "^0.5.4",
    "karma": "~1.4.1",
    "karma-chrome-launcher": "~2.0.0",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^0.2.0",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "karma-sourcemap-loader": "^0.3.7",
    "less-loader": "^2.2.3",
    "postcss-loader": "^0.13.0",
    "postcss-url": "^5.1.2",
    "protractor": "~5.1.0",
    "raw-loader": "^0.5.1",
    "sass-loader": "^4.1.1",
    "script-loader": "^0.7.0",
    "source-map-loader": "^0.1.5",
    "style-loader": "^0.13.1",
    "stylus-loader": "^2.4.0",
    "ts-node": "~2.0.0",
    "tslint": "~4.5.0",
    "typescript": "~2.0.0",
    "url-loader": "^0.5.7",
    "webpack-dev-server": "~2.3.0"
  }
}

app.component.ts

declare module 'aws-sdk' {
   var foo:any;
   export = foo;
}

import * as AWS from 'aws-sdk';
.......
.......

@Component({selector: 'app-basic', templateUrl: './app.component.html', styleUrls: ['./app.component.css']})
export class AppComponent {
  countReactions(myprefix) {
    var s3 = new AWS.S3();
    var params = {
      Bucket: 'mybucket',
      Prefix: myprefix,
    };
    s3.listObjectsV2(params, function (err, data) {
      if (err) 
        console.log(err, err.stack); // an error occurred
      else 
        console.log(data); // successful response
      }
    );
  }
}

Answer 1

Adding "node" to types in tsconfig.app.json file that the angular-cli creates in the src directory as below:

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "module": "es2015",
    "baseUrl": "",
    "types": ["node"]
  },
  "exclude": [
    "test.ts",
    "**/*.spec.ts"
  ]
}

Based on these TypeScript docs :

Specify "types": [] to disable automatic inclusion of @types packages

Since types is empty, it is excluding the node typings that you installed via npm install @types/node.

Answer 2

In src/tsconfig.app.json

Replacing

"types": []

with "types": ["node"]

will work in Angular 5.

Answer 3

I had similar issue while using aws-sdk-js.

Reason for this issue is because of node types. This is what I did

npm install --save @types/node
npm install --save @types/aws-sdk

Add this line under compilerOptions in tsconfig.json

"typeRoots": ["node_modules/@types"],

Answer 4

I found a solution for me.

You need to install the typing definitions for aws-sdk :

npm install --save-dev @types/aws-sdk

I got some errors about invalid peer dependencies from npm during that, but it worked anyway.

You might get another error when compiling your application though, stating that the import syntax used in aws-sdk is not compatible with ECMAScript2015. I had to change compilerOptions.module to "es5" instead of "es2015" in my tsconfig.app.json to get it to work finally.